Snape's death

[Liz Clark]

No: HPFGUIDX 191240

Liz: Going off on a little tangent now, but all this talk of Snape's death has got me curious!

Why didn't LV use AK on Snape? I haven't got to reading DH yet, only about half way through OotP, or seen the film but I know Nagini was used. This, to me, seems to indicate LV didn't want to kill Snape, he showed 'feelings' for him, even a bit of remorse? This is SO out of character for LV!

Of course, it was vital to the story that Snape wasn't killed outright, 
because of the memories, but what are everyone's feelings about the method of death?